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Spectroscopic investigation and local structure of Eu3+ ions in lead phosphate glasses for optical device applications

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Optik 2024年 300卷

作者： Basavapoornima, Ch. Masthanaiah, E. Vijaya, N. Depuru, Shobha Rani Kaewkhao, J. Pecharapa, Wisanu Jayasankar, C.K. Department of Physics Sri Venkateswara University Tirupati517 502 India Institute of Aeronautical Engineering Hyderabad500 043 India Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Pathom Nakhon73000 Thailand Nakhon Pathom Rajabhat University Pathom Nakhon73000 Thailand College of Materials Innovation and Technology King Mongkut's Institute of Technology Ladkrabang Bangkok Ladkrabang10520 Thailand

Phosphate-based glasses are promising materials which are being employed for broad range of applications whereas Eu3+ is an efficient activator due to its predominant 5D0 →7F2 emission (red region). In this direction, an attempt has been made to investigate the effect of Eu3+ ions doped lead phosphate glasses (PPbKANEu: P2O5+PbO+K2O+Al2O3+Na2O+Eu2O3) to explore possible photonic device applications. Optical absorption, excitation, photoluminescence and decay rates are used to characterize the PPbKANEu glasses. The photoluminescence spectrum of Eu3+:PPbKAN glasses exhibit emission channels from the first excited (5D0) to the ground (7FJ (J =0–4)) multiplets. To determine the local site symmetry of surrounding Eu3+ ions, the relative fluorescence intensity ratio of 5D0→7F1 versus 5D0→7F2 emission channels has been analyzed. The emission spectrum of PPbKANEu glasses exhibits a comprehensive lifting of degeneracy of 5D0→7F2 and 5D0→7F1 emission channels. By considering C2v symmetry for Eu3+ ions, the second (B02= −406 and B22=−158) and fourth (B04=980, B24=297 and B44=926 cm–1) rank crystal–field (CF) characteristics were estimated along with CF strength factor (S= 402 cm–1). The lifetime of 5D0 state is estimated to be 2.09, 2.23, 2.21 and 2.21 ms for 0.1, 0.5, 1.0 and 2.0 mol% of Eu3+ ions, respectively. The analysis of the decay times reveals that the lifetime of 5D0 state is less affected by the concentration of the Eu3+ ion. The results are compared and discussed with reported values and confirm the potentiality of the PPbKANEu glasses for optical device applications in visible regions. © 2024 Elsevier GmbH

关键词： Ions

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Structural effect of fluorophore on phenylboronic acid fluorophore/cyclodextrin complex for selective glucose recognition

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Frontiers of Chemical science and engineering 2020年第1期14卷 53-60页

作者： Takeshi Hashimoto Mio Kumai Mariko Maeda Koji Miyoshi Yuji Tsuchido Shoji Fujiwara Takashi Hayashita Department of Materials and Life Sciences Faculty of Science and TechnologySophia UniversityTokyo102-8554Japan Department of Life Science and Medical Bioscience Graduate School of Advanced Science and EngineeringWaseda University(TWIns)Tokyo162-8480Japan Department of Current Legal Studies Faculty of LawMeiji Gakuin UniversityKanagawa244-8539Japan

Based on the design of the fluorescent site of a fluorescent probe,we have created a unique system that changes its twisting response to *** probes were synthesized,in which phenylboronic acid and two kinds of aromatic fluorescent site(pyrene or anthracene)were conjugated by an amide *** the fluorescence measurement of pyrene-type probe 1,dimer fluorescence was observed at high *** induced circular dichroism(ICD)experiments,a response was observed only in the presence of glucose and γ-cyclodextrin,and no response was seen with *** the other hand,in the fluorescence measurement of anthracene-type probe 2,dimer fluorescence was observed in the presence of both glucose and galactose,and the fluorescence was different from the case of *** the ICD spectra of these inclusion complexes were measured,an inversion of the Cotton effect,which indicates a change in the twisted structure,was observed in galactose and *** differences in response to monosaccharides may originate in the interaction between the fluorescent site and the cyclodextrin cavity.

关键词： sugar recognition phenylboronic acid cyclodextrin fluorescence response induced circular dichroism

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Antitumor efficacy and potential mechanism of FAP-targeted radioligand therapy combined with immune checkpoint blockade

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Signal Transduction and Targeted Therapy 2024年第7期9卷 2936-2952页

作者： Liang Zhao Yizhen Pang Yangfan Zhou Jianhao Chen Hao Fu Wei Guo Weizhi Xu Xin Xue Guoqiang Su Long Sun Hua Wu Jingjing Zhang Zhanxiang Wang Qin Lin Xiaoyuan Chen Haojun Chen Department of Nuclear Medicine and Minnan PET Center Xiamen Key Laboratory of RadiopharmaceuticalsThe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenChina Departments of Diagnostic Radiology SurgeryChemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and College of Design and EngineeringNational University of SingaporeSingaporeSingapore Clinical Imaging Research Centre Centre for Translational MedicineYong Loo Lin School of MedicineNational University of SingaporeSingaporeSingapore Department of Radiation Oncology Xiamen Cancer CenterXiamen Key Laboratory of Radiation OncologyThe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenChina Department of Colorectal Tumor Surgery Xiamen Cancer CenterXiamen Key Laboratory of Radiation OncologyThe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenChina Department of Cardiothoracic Surgery Zhongda HospitalSchool of MedicineSoutheast UniversityNanjingChina Nanomedicine Translational Research Program NUS Center for NanomedicineYong Loo Lin School of MedicineNational University of SingaporeSingaporeSingapore Department of Neurosurgery and Department of Neuroscience Fujian Key Laboratory of Brain Tumors Diagnosis and Precision TreatmentXiamen Key Laboratory of Brain Centerthe First Affiliated Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamenChina Institute of Molecular and Cell Biology Agency for ScienceTechnology and Research(A*STAR)SingaporeSingapore Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamenChina

Radiotherapy combined with immune checkpoint blockade holds great promise for synergistic antitumor *** radionuclide therapy delivers radiation directly to tumor ***1004 is a fibroblast activation protein(FAP)-targeting radiopharmaceutical,conjugated with the albumin binder Evans Blue,which has demonstrated enhanced tumor uptake and retention in previous preclinical and clinical ***,we demonstrate that^(68)Ga/^(177)Lu-labeled LNC1004 exhibits increased uptake and prolonged retention in MC38/NIH3T3-FAP and CT26/NIH3T3-FAP tumor *** therapy with^(177)Lu-LNC1004 induced a transient upregulation of PD-L1 expression in tumor *** combination of^(177)Lu-LNC1004 and anti-PD-L1 immunotherapy led to complete eradication of all tumors in MC38/NIH3T3-FAP tumor-bearing mice,with mice showing 100%tumor rejection upon ***,single-cell RNA sequencing(scRNA-seq),and TCR sequencing revealed that combination therapy reprogrammed the tumor microenvironment in mice to foster antitumor immunity by suppressing malignant progression and increasing cell-to-cell communication,CD8^(+)T-cell activation and expansion,M1 macrophage counts,antitumor activity of neutrophils,and T-cell receptor diversity.A preliminary clinical study demonstrated that^(177)Lu-LNC1004 was well-tolerated and effective in patients with refractory ***,scRNA-seq of peripheral blood mononuclear cells underscored the importance of addressing immune evasion through immune checkpoint blockade *** was emphasized by the observed increase in antigen processing and presentation juxtaposed with T cell *** conclusion,our data supported the efficacy of immunotherapy combined with^(177)Lu-LNC1004 for cancer patients with FAP-positive tumors.

关键词： immunity retention holds

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Construction of dual Z-scheme Ag3VO4–BiVO4/InVO4 photocatalysts using vanadium source from spent catalysts for contaminated water treatment and bacterial inactivation

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Chemosphere 2024年 363卷 142746页

作者： Lee, Kuen-Chan Hsu, Shih-Chieh Huang, Jen-Hsien Wang, Kuan-Syun Pang, Wei Kong Hu, Chih-Wei Jiang, Yi-Jhen Cho, Er-Chieh Weng, Huei Chu Liu, Ting-Yu Department of Science Education National Taipei University of Education No. 134 Sec. 2 Heping E. Road Da-an District Taipei City106 Taiwan PhD Program in Medical Neuroscience College of Medical Science and Technology Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Department of Chemical and Materials Engineering Tamkang University No. 151 Yingzhuan Road Tamsui District New Taipei City25137 Taiwan Department of Green Material Technology Green Technology Research Institute CPC Corporation No.2 Zuonan Rd. Nanzi District Kaohsiung City81126 Taiwan Department of Materials Engineering Ming Chi University of Technology New Taipei City243303 Taiwan Faculty of Engineering Institute for Superconducting & Electronic Materials University of Wollongong WollongongNSW Australia National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsinchu30076 Taiwan School of Pharmacy College of Pharmacy Taipei Medical University 250 Wuxing Street Taipei City110 Taiwan Department of Mechanical Engineering Chung Yuan Christian University No. 200 Chungpei Road Chungli District Taoyuan City32023 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan City32003 Taiwan College of Engineering & Center for Sustainability and Energy Technologies Chang Gung University Taoyuan33302 Taiwan

Vanadate-based photocatalysts have recently attracted substantial attention owing to their outstanding photocatalytic activity for degrading organic pollutants and generating energy via photocatalytic processes. However, the relatively high price of vanadium has hindered the development of vanadate-based photocatalysts for various applications. Spent catalysts obtained from oil refineries typically contain a significant quantity of vanadium, making them valuable for recovery and utilization as precursors for the production of high-value-added photocatalysts. In this study, we transformed the V present in spent catalysts produced by the petrochemical industry into ternary vanadate-based photocatalysts [BiVO4/InVO4/Ag3VO4 (BVO/IVO/AVO, respectively)] designed for water remediation. The ternary composites revealed an enhanced photocatalytic capability, which was 1.42 and 5.1 times higher than those of the binary BVO/IVO and pristine AVO due to the facilitated charge separation. The ternary photocatalysts not only effectively treated wastewater containing various organic dyes, such as methylene blue (MB), rhodamine 6G (R6G), and brilliant green (BG), but also exhibited remarkable photocatalytic performance in the degradation of antibiotics, reduction of Cr(VI), and bacterial inactivation. This paper proposes a feasible route for recycling industrial waste as a source of vanadium to produce highly efficient vanadate-based photocatalysts. © 2024 Elsevier Ltd

关键词： Water pollution

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Emergence of a new band and the Lifshitz transition in kagome metal ScV6Sn6 with charge density wave

arXiv

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arXiv 2023年

作者： Kang, Seoung-Hun Li, Haoxiang Meier, William R. Villanova, John W. Hus, Saban Jeon, Hoyeon Suriya Arachchige, Hasitha W. Lu, Qiangsheng Gai, Zheng Denlinger, Jonathan Moore, Rob Yoon, Mina Mandrus, David Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Materials Science and Engineering Department University of Tennessee Knoxville KnoxvilleTN37996 United States Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Physics and Astronomy University of Tennessee Knoxville KnoxvilleTN37996 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States

Topological kagome systems have been a topic of great interest in condensed matter physics due to their unique electronic properties. The vanadium-based kagome materials are particularly intriguing since they exhibit exotic phenomena such as charge density wave (CDW) and unconventional superconductivity. The origin of these electronic instabilities is not fully understood, and the recent discovery of a charge density wave in ScV6Sn6 provides a new avenue for investigation. In this work, we investigate the electronic structure of the novel kagome metal ScV6Sn6 using angle resolved photoemission spectroscopy (ARPES), scanning tunneling microscopy (STM), and first-principles density functional theory calculations. Our analysis reveals for the first time the temperature-dependent band changes of ScV6Sn6 and identifies a new band that exhibits a strong signature of a structure with CDW below the critical temperature. Further analysis revealed that this new band is due to the surface kagome layer of the CDW structure. In addition, a Lifshitz transition is identified in the ARPES spectra that is related to the saddle point moving across the Fermi level at the critical temperature for the CDW formation. This result shows the CDW behavior may also be related to nesting of the saddle point, similar to related materials. However, no energy gap is observed at the Fermi level and thus the CDW is not a typical Fermi surface nesting scenario. These results provide new insights into the underlying physics of the CDW in the kagome materials and could have implications for the development of materials with new functionality. Copyright © 2023, The Authors. All rights reserved.

关键词： Charge density waves

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Single step wet-chemical deposition of cesium doped β-Ga2O3 nanostructured films for memristor application

Memories - Materials, Devices, Circuits and Systems

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Memories - materials, Devices, Circuits and Systems 2022年 2卷

作者： Suman, Siddhartha Mukurala, Nagaraju Mohapatra, Lokanath Kushwaha, Ajay Kumar Department of Metallurgy Engineering and Materials Science Indian Institute of Technology Indore Simrol IndoreM.P.453552 India Centre for Advanced Electronics Indian Institute of Technology Indore Simrol IndoreM.P.453552 India

Cesium doped gallium oxide (Cs-Ga2O3) nanostructured films are deposited using wet-chemical approach in single step process. Effect of different concentration of Cs (1% to 100 % molar concentration with respect to concentration of Ga precursor) on morphological, structural, optical and electrical properties of doped Ga2O3 nanostructured films are investigated. The morphology (diamond shaped nanostructures) remains intact for lower doping concentration of Cs (1 to 7.5% of Cs molarity with respect to Ga molarity in precursor solution) whereas when doping concentration is increased (10 to 100% of Cs with respect to Ga molarity in precursor solution) the morphology drastically changed to flower and clustered particles. The shift in diffraction pattern indicates the presence of Cs inside the Ga2O3 crystals. The high amount of Cs in precursors solution (half or equal molarity of Cs with respect to Ga molarity (50 to 100%)) in precursor solution results doping as well as formation of dicesium oxide. The doping of Cs is further confirmed by X-ray photoelectron spectroscopy. The electrical conductivity of doped Ga2O3 nanostructured films varies with variation in Cs ions concentration. The higher resistance is noticed in memristor device when the doping concentration is lesser. The RON/ROFF ratio is decreased after Cs doping and to be found only 101 orders but altering the switching speed of the memory device. © 2022 The Author(s)

关键词： Memristors

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Synthesis, characterization, catalytic reduction of Eosin B dye and C, N cross coupling reactions of sodiumalginate/V2O5 nanocomposite

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Journal of the Taiwan Institute of Chemical Engineers 2023年 142卷

作者： Anbarasan, R. Thamizhlarasan, A. Liu, Yu-Cheng Tung, Kuo-Lun Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Saveetha School of Engineering SIMATS Tamil Nadu Thandalam602 100 India Department of Polymer Technology KCET Tamil Nadu Madurai625 701 India Advanced Research Center for Green Materials Science and Technology National Taiwan University Taipei10617 Taiwan National Taiwan University Taipei10617 Taiwan

Background: A low cost with high efficiency sodiumalginate (SA)/V2O5 nanocomposite catalyst was synthesized by complexation followed by reduction method. The V2O5 catalyst and SA was chemically linked with each other and hence restriction in diffusion of the catalyst into the reaction medium during the course of the reaction. The catalytic activity of SA/V2O5 bio-nano catalyst system was tested towards the C, N cross coupling reaction and reduction of EB dye. Methods: The bio-polymer nanocomposite formation was confirmed by FT-IR spectroscopy, 1H-NMR spectroscopy, DSC (Tg) and TGA (Td) and HR-TEM (size) like analytical tools. The cross coupling reaction between rosebengal (RB) and nitrogen containing heterocyclic compounds like indole, benzimidazole, 2-methylimidazole were carried out. Same type of reaction was carried out with congored (CR), acidfuchsin (AF) and safranine O (SO) dyes. Further, the catalytic activity of SA/V2O5 nanocomposite catalyst was tested towards the reduction of Eosin blue (EB) dye. Significant findings: The FTIR spectrum showed a peak at 615 cm−1 due to the V-O stretching. The 1H-NMR spectrum confirmed that the OH group of SA involved in the complex formation with V atom of V2O5. The Tg and Td of the SA/V2O5 bio-polymer nanocomposite system was higher than that of the neat polymer. The apparent rate constant (kapp) value was found to be higher in the presence of SA/V2O5 catalyst system. The C,N cross coupling reaction was successfully carried out with significant % yield in the presence of low cost and eco-friendly SA/V2O5 nano catalyst. The catalyst was stable up to several cycles of operations. © 2022 Taiwan Institute of Chemical Engineers

关键词： Synthesis (chemical)

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All-Polymer Nanocomposites Having Superior Strength, Toughness and Ultralow Energy Dissipation

SSRN

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SSRN 2023年

作者： Wan, Haixiao Li, Sai Wang, Yachen Chen, Zhudan He, Junwei Li, Chunhua Liu, Gengxin Liu, Jun Wang, Xiaodong Russell, Thomas P. Zhang, Liqun State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China Institute of Automation Beijing University of Chemical Technology Beijing100029 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension Materials Donghua University Shanghai201620 China Institute of Emergent Elastomers School of Materials Science and Engineering South China University of Technology Guangzhou510641 China Polymer Science and Engineering Department University of Massachusetts Amherst 120 Governors Drive AmherstMA01003 United States Materials Sciences Division La Wrence Berkeley National Laboratory BerkeleyCA94720 United States

Toughening polymers has attracted significant interest. Traditionally, polymer toughness is enhanced by constructing polymer networks or introducing sacrificial bonds into the chains between crosslink points. These strategies, though, introduce pronounced energy dissipation and associated heat, both of which are undesirable under long-term cyclic loading, for example at the interface of implants in the human body. By incorporating single-chain nanoparticles (SCNPs) into linear polymer chains to generate all-polymer nanocomposites (APNCs), we have been able to achieve high strength, high toughness with low energy dissipation. Using a combination of simulation and experimental results, we are advancing a "SCNPs effect" where tightly cross-linked SCNPs produce a modulus contrast to achieve strengthening and toughening. Benefitting from the soft interface, the penetrable and deformable SCNPs cause the surrounding polymer chains to move in concert, significantly reducing the interfacial friction to achieve low energy dissipation. The intramolecular cross-linking of the SCNPs and adhesion between the SCNPs and polymer matrix are critical for realizing such high-performance systems. Based on a Gaussian regression model and back propagation (BP) neural network, the mechanical strength can be predicted and is supported by simulations. The APNC concept described can be applied to elastomers and gels, broadening its utilization in high-cycle and low-dissipation applications, like soft robots, flexible sensors and cartilage replacements, and artificial heart valves. © 2023, The Authors. All rights reserved.

关键词： Energy dissipation

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Bi13S18X2-Based Solar Cells (X = Cl, Br, I): Photoelectric Behavior and Photovoltaic Performance

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Physical Review Applied 2021年第3期15卷 034040-034040页

作者： Sen Li Linfeng Xu Xinggang Kong Takafumi Kusunose Noriaki Tsurumachi Qi Feng Department of Advanced Materials Science Faculty of Engineering and Design Kagawa University 2217-20 Hayashi-cho Takamatsu 761-0396 Japan Institute of Environment-friendly Materials and Occupational Health (Wuhu) and School of Earth and Environment Anhui University of Science and Technology Huainan Anhui 241000 China School of Materials Science and Engineering Shaanxi University of Science and Technology Weiyang Xi'an Shaanxi 710021 PR China

Bismuth chalcohalides of Bi13S18X2 (X = Cl,Br,I) are solvothermally synthesized and systematically characterized as a light absorber for photovoltaics. Rietveld refinements reveal that Bi13S18X2 compounds adopt the same hexagonal structure with space group P3 and a chemical composition of (Bi3+)12(Bi24+)0.5(S2−)18(X−)2, where a triangular tunnel is constructed from [Bi4S6]-ribbon spokes in the c-axial direction, X− is located in the tunnel sites, and Bi(II) dimers of (Bi24+) are located at the hexagonal center. The photoelectric behavior is investigated using ultraviolet-to-visible-to-near-infrared (UV-vis-NIR) absorption spectroscopy, ultraviolet photoelectron spectroscopy, x-ray photoelectron spectroscopy, Mott-Schottky plots, and conductivity measurements. The Bi13S18X2 compounds are indirect n-type semiconductors with narrow band gaps of 0.76, 0.80, and 0.81 eV for Bi13S18Cl2, Bi13S18Br2, and Bi13S18I2, respectively, and exhibit strong light absorbance over a wide wavelength range from UV to NIR. A facile physical vapor deposition approach is developed for the fabrication of a homogeneous Bi13S18X2 thin film to study the photovoltaic performances. Solar cells with the architecture fluorine-doped tin oxide/TiO2/Bi13S18X2/(I3−/I− redox couple)/Pt demonstrate power conversion efficiencies of 0.91, 1.12, and 0.75% for Bi13S18Cl2, Bi13S18Br2, and Bi13S18I2, respectively. The highest cell performance of Bi13S18Br2 can be attributed to its higher light-absorption ability.

关键词： Optoelectronics Photovoltaic absorbers Photovoltaic effect Solar cells Semiconductor compounds Sample preparation

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High Performance CsPbI3 NCs Decorated Few-layer WS2 Hybrid Photodetectors

High Performance CsPbI3 NCs Decorated Few-layer WS2 Hybrid P...

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International Conference on Emerging Electronics (ICEE)

作者： Shreyasi Das Arup Ghorai Sourabh Pal Somnath Mahato Soumen Das Samit K. Ray School of Nano Science and Technology Indian Institute of Technology Kharagpur India Department of Materials Science and Engineering Pohang University of Science and Technology Korea Advanced Technology Development Centre Indian Institute of Technology Kharagpur India School of Medical Science and Technology Indian Institute of Technology Kharagpur India Department of Physics Indian Institute of Technology Kharagpur India

A promising device architecture that can achieve high response in photodetector devices can be consists of an effective semiconductor layer with high carrier mobility and highly photoabsorbing material. Here, we report a superior broadband visible photodetector with a few-layer tungsten disulfide (WS 2 ) decorated with cesium lead iodide (CsPbI 3 ) nano-crystals (NCs) in hybrid heterojunctions. An enhancement in photocurrent is demonstrated in the CsPbI 3 NCs decorated WS 2 0D/2D hybrid nanostructure compared to pristine WS 2 , revealing the potential of hybrid systems in next generation optoelectronic devices.

关键词： Performance evaluation Iodine compounds Tungsten Lead Heterojunctions Photodetectors Hybrid power systems

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